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      1 /*
      2  * Copyright (C) 2012 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *    * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *    * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *    * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 
     33 // Magic pretend-to-be-a-chromium-build flags
     34 #undef WEBKIT_IMPLEMENTATION
     35 #undef LOG
     36 
     37 #include "content/content_detector.h"
     38 
     39 #include "public/android/WebDOMTextContentWalker.h"
     40 #include "public/android/WebHitTestInfo.h"
     41 
     42 #include "Document.h"
     43 #include "Node.h"
     44 #include "Page.h"
     45 #include "Settings.h"
     46 
     47 using WebKit::WebDOMTextContentWalker;
     48 using WebKit::WebRange;
     49 
     50 ContentDetector::Result ContentDetector::FindTappedContent(
     51     const WebKit::WebHitTestInfo& hit_test) {
     52   if (!IsEnabled(hit_test))
     53     return Result();
     54   WebKit::WebRange range = FindContentRange(hit_test);
     55   if (range.isNull())
     56     return Result();
     57 
     58   std::string text = GetContentText(range);
     59   GURL intent_url = GetIntentURL(text);
     60   return Result(range, text, intent_url);
     61 }
     62 
     63 WebRange ContentDetector::FindContentRange(
     64     const WebKit::WebHitTestInfo& hit_test) {
     65   WebDOMTextContentWalker content_walker(hit_test, GetMaximumContentLength());
     66   string16 content = content_walker.content();
     67   if (content.empty())
     68     return WebRange();
     69 
     70   size_t selected_offset = content_walker.hitOffsetInContent();
     71   for (size_t start_offset = 0; start_offset < content.length();) {
     72     size_t relative_start, relative_end;
     73     if (!FindContent(content.begin() + start_offset,
     74         content.end(), &relative_start, &relative_end)) {
     75       break;
     76     } else {
     77       size_t content_start = start_offset + relative_start;
     78       size_t content_end = start_offset + relative_end;
     79       DCHECK(content_end <= content.length());
     80 
     81       if (selected_offset >= content_start && selected_offset < content_end) {
     82         WebRange range = content_walker.contentOffsetsToRange(
     83             content_start, content_end);
     84         DCHECK(!range.isNull());
     85         return range;
     86       } else {
     87         start_offset += relative_end;
     88       }
     89     }
     90   }
     91 
     92   return WebRange();
     93 }
     94 
     95 WebCore::Settings* ContentDetector::GetSettings(const WebKit::WebHitTestInfo& hit_test) {
     96   if (!hit_test.node() || !hit_test.node()->document())
     97     return 0;
     98   return hit_test.node()->document()->page()->settings();
     99 }
    100